JPH08228432A - Power distribution system operating unit - Google Patents

Abstract

PURPOSE: To surely detect a power failure by instructing the operation of switches by using a remote supervisory master-station device and subordinate-station device in accordance with a switch operating procedure for circulating electric power to a sound interrupted section on the load side from a disconnected section. CONSTITUTION: When an instantaneous ground failure occurs due to disconnection, the breaking and reclosing operations of a circuit breaker 1 are inputted to an arithmetic device 13 through an information transmitter 18 and the operation of a disconnection detecting relay and opening/ closing states of switches are also inputted to the device 13 through a TC subordinate-station device 15 and mater-station device 12 and a disconnected section discriminating means 13A discriminates a disconnected section based on the information. When the power source-side section of a switch SW2 is discriminated as the disconnected section, a power circulating switch operating procedure preparing means 13C prepares a switch operating procedure for circulating electric power to the section after the switch SW2 and performs power circulating calculation. Then a disconnected section cutoff switch operating procedure preparing means 13B cuts off the disconnected section and prepares the opening procedure of the switch which is nearest to the power source and a switching operation instructing means 13D outputs an operation executing instruction to the TC master-station device 12. Therefore, the disconnected section can be detected exactly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution system operating device for detecting a power failure accident due to a disconnection occurring in a distribution system.

[0002]

2. Description of the Related Art Conventionally, when an instantaneous ground fault occurs due to a disconnection in a distribution system, the protective device installed at the substation side does not continue the ground fault condition. There was a case that could not be detected. Generally, as a method of detecting this accident point, a timed accident investigation method is used in which the reclosing device installed at the substation and the breaker for the distribution line are combined to charge the section of the distribution line. There is.

That is, after the circuit breaker for the distribution line is turned on, the switches are sequentially closed from the power source side for each section at constant time intervals, and the circuit breaker for the distribution line is cut within a predetermined time after a certain switch is closed. This is a method in which the load side section of the switch that was closed immediately before that is judged to be the accident section when the switch is re-cut off.
However, in this method, when the ground fault accident does not continue due to the occurrence of the disconnection, there is a problem that the location of the disconnection may be erroneously recognized.

[0004]

Therefore, when the ground fault accident due to the disconnection does not continue, the breaker for the distribution line will not be interrupted again, so it is necessary to investigate the location of the breaker. There is also a case to mobilize the maintenance staff. Therefore, the conventional detection method using the protective device of the substation is not sufficient. Further, in a power distribution system that is complicated and whose system configuration changes daily, once a power failure accident due to a wire break occurs, it takes a lot of labor and time to find the wire break point.

In recent years, the social situation against the demand for electric power demands the qualitative improvement of the electric power supply. For this reason, it is necessary to early find the place where the instantaneous ground fault has occurred due to the disconnection, and the section where the disconnection occurs. The early creation of a switch operating procedure for removing the above was mentioned as an issue that must be solved immediately. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a distribution system operation device capable of reliably detecting a power failure accident due to a disconnection.

[0006]

DISCLOSURE OF THE INVENTION A distribution system operating device according to [Claim 1] of the present invention provides a signal indicating a disconnection state of a circuit breaker for a distribution line of a distribution system, and a distribution line divided into a plurality of sections. Whether the switching status signal of the switch to be connected, the remote monitoring control slave station device provided with a disconnection detection relay that detects the disconnection state for each section of the distribution line, and the load current signal of each distribution line are set in advance or , A section load current signal taken online by using a remote monitoring and control master station, and how the distribution sections are connected to each other, and a distribution system operation apparatus for operating a distribution system using connection information In the above, on the condition that the breaker for distribution line has operated, the information on the disconnection detection relay of the remote monitoring and control slave station device installed on the distribution line and the open information of the switch are used to Disconnection section disconnection switch operation that creates a disconnection section determination means that determines the section on the power supply side where the remote monitoring control slave station device that is operating at the same time is the disconnection section and an operation procedure for removing the disconnection section A procedure creating means, a switch operating procedure creating means for creating a switch operating procedure for accommodating electric power from the disconnection section to a sound power failure section on the load side, and the switch operating procedure creating the switch operating procedure as the remote monitoring control master station device. And a switch operation instruction means that is executed by using the remote monitoring control slave station device.

In the distribution system operation device according to [Claim 2] of the present invention, in [Claim 1], the circuit is opened by the operation of the disconnection detection relay a predetermined time after the circuit breaker of the distribution line breaker is obtained. It is configured to detect whether there is a switch, and when there is a switch satisfying these conditions, determine the power supply side section of the switch as a disconnection section.

[0008]

[Operation] In the event of an instantaneous ground fault due to a wire break in the distribution system, the protective device installed in the substation will break the circuit breaker for the distribution line, and the reclosing device will break the circuit for the distribution line after a certain period of time. The breaker is turned on. In the broken distribution line, the conductor portion once comes into contact with the ground or a structure to be in a ground fault state, but thereafter, the ground fault state often does not continue due to the insulator covering the conductor portion of the distribution line. Therefore, the breaker for the distribution line is not cut off again. In such a case, the distribution system operation device according to [Claim 1] and [Claim 2] of the present invention obtains the information of the TC slave station installed on the distribution line after a certain period of time, and disconnects the relay. Search for the TC slave station in which the operation information and the opening information of the switch are set at the same time. The section on the power source side of this TC slave station is determined as the section where the disconnection occurs.

The failure detection function when a failure occurs in the power distribution system using the TC slave station provided with the disconnection detection relay and the switch will be described. When a voltage is applied to the power source side, the TC slave station turns on the switch after a lapse of an arbitrarily set fixed time. When the operation of the disconnection detection relay is detected within the fixed time until the switch is closed, the TC slave station stops the closing operation of the switch and maintains the open state. Therefore, the disconnection section determination means determines that the section on the power source side of the TC slave station that maintains the switch open state along with the operation of the disconnection relay is the disconnection section.

Further, since the load side switch in the disconnection section maintains the open state, a power failure occurs in the load side section from the switch. Therefore, the switch operating procedure creating means creates a flexible operating procedure for the section, and the switch operating instructing means executes the switch operating procedure. Next, the switch operating procedure creating means creates a switch operating procedure for disconnecting the section where the disconnection occurs from the system, and the switch operating instruction means executes the switch operating procedure.
In addition, a switch operating procedure creating means for creating a switch operating procedure for accommodating electric power to a newly generated healthy blackout section due to the disconnection operation of the disconnecting section is created by the switch operating procedure creating means. Run by.

[0011]

Embodiments will be described below with reference to the drawings. FIG.
FIG. 1 is a configuration diagram of an embodiment of a distribution system operation device according to [Claim 1] of the present invention. This figure is shown focusing on a part of one distribution line in the distribution system.
The distribution line breaker 1 that connects the distribution line 200 to 0, the ground fault detection device 2 that has a function of detecting the ground fault and blocking the distribution line breaker 1, and the distribution line breaker 1 have broken At this time, in the distribution system composed of the reclosing device 3 having a function of turning on the distribution line breaker 1 after a certain period of time and the switches SW1, SW2, SW3 ,. Each switch SW1, SW2, SW3 ...
Disconnection detection relay 1 that detects disconnection between the power supply side and load side of the
7 ₁ , 17 ₂ , 17 ₃ , ... are each switch SW1, SW2, S
Installed in correspondence with W3, ..., In addition, each switch SW1,
SW2, SW3, TC slave station 15 ₁ to transmit a closing signal of the disconnection detection signal or switches provided corresponding to ...,
15 ₂ , 15 ₃ , ... and these TC slave stations 15 ₁ , 15 ₂ , 1
5 ₃ , ... TC master station 12 that controls, and power breaker 1
The information transmission device 18 for transmitting the closing cutoff signal and the calculation device 13 are included.

The TC slave stations 15 ₁ , 15 ₂ , 15 ₃ , ... Have the function of opening the corresponding switches SW1, SW2, SW3, .. It has a function of closing a circuit after a fixed time when a voltage is applied, and a function of maintaining an open circuit when the disconnection detection relay 17 detects a disconnection within the fixed time.

Further, the arithmetic unit 13 receives the interruption signal of the circuit breaker for the distribution line obtained from the information transmission unit 18, and the TC master station unit 12.
A disconnection section determination means 13A for determining the disconnection occurrence section from the disconnection detection signal obtained from the switch or the switching signal of the switch, and a switch operating procedure creation to exchange power to all sections that are out of power due to an instantaneous ground fault due to the disconnection And a disconnection section disconnection switch operation procedure creating means 13B for removing the determined disconnection section from the distribution system, and a power interchange that creates a switch operation procedure for exchanging power with a healthy section on the load side that causes a power failure after removal. The switch operation procedure creating means 13C and the switch operation instruction means 13D for executing each created switch operation procedure via the TC master station 12 and the TC slave station 15 are provided.

The operation of the above device will be described. First,
The functions of the TC slave stations 15 ₁ , 15 ₂ , 15 ₃ , ... Will be described with reference to FIG. Since the TC slave stations 15 ₁ ... 15 ₃ have the same function, the subscripts are omitted in the following description common to each TC slave station. FIG. 2 is a flowchart showing the operation of the TC slave station 15. Step S21 is TC slave station 15
If there is no change in the power supply voltage, the current state is maintained. It also indicates that the process proceeds to step S22 when the power supply voltage changes. In step S22, if the power supply voltage is exhausted, it means that the process proceeds to step S28. If the power supply voltage is applied, step S22 is executed.
It shows that it moves to 23.

Steps S23 and S25 indicate that the processing is repeated for a fixed time. Steps S22 to S
After shifting to 28, the TC slave station 15 opens the switch. When the process proceeds from step S22 to step S23, TC
The slave station 15 repeats steps S23, S24, and S25 for a certain period of time. At this time, if the operation of the disconnection detection relay 17 is not detected in step S24, the process proceeds to step S26. Step S26 shows that the switch SW is closed.

The relationship between the TC slave station 15 and the open / close state of the switch SW is shown in the time chart of FIG. TC slave station at time t ₁
When the power supply voltage of 15 disappears, the switch SW is opened, and when the power supply voltage is applied again at time t ₂ , the switch SW is closed at time t ₃ after the elapse of a certain time Tx. When the operation of the disconnection detection relay 17 is detected in step S24 while repeating step S23, step S24, and step S25, the process proceeds to step S27.

Step S27 shows that the switch SW is opened. The relationship between the open / closed state of the TC slave station 15 and the switch SW and the operating state of the disconnection detection relay 17 at this time is shown in the time chart of FIG. The TC slave station 15 opens the switch when it detects the operation of the disconnection detection relay 17 within a certain time after the power supply voltage is applied.

Next, the operation of the power distribution system operation device when an instantaneous ground fault occurs due to disconnection will be described with reference to FIGS. FIG. 5 shows one distribution line of the distribution system. The distribution line breaker 1, the ground fault detection device 2, the reclosing device 3, the switches SW1, SW2, SW3, and the other distribution system are interconnected. Normally open interconnection switch TSW6 installed for the purpose of
5. It is composed of a normally open interconnection switch TSW7.

The distribution system shown in FIG. 5 is in a state in which the entire section from the circuit breaker 1 for the distribution line is charged, and shows a normal state.
In such a state, it is assumed that, for example, a disconnection occurs in an arbitrary phase of the three-phase distribution line at point A, and an instantaneous ground fault occurs due to the conductor portion of the disconnected distribution line contacting the ground.

FIG. 6 shows a distribution line breaker 1, a switch SW1, a switch SW2, and a switch S when an instantaneous ground fault occurs due to the conductor portion of the broken distribution line coming into contact with the ground.
It is a time chart which showed reaction of W3 and a disconnection detection relay. At time T61, the breaker 1 for the distribution line is cut off by the ground fault detection of the ground fault detection device 2, and the TC slave station 1
By 5 _1, 15 _2, 15 _3, the supply voltage loss, switch SW1, switch SW2, switch SW3 is in the released state.

Thereafter, at time T62, the circuit breaker 1 for the distribution line is reclosed by the reclosing device 3 so that the section A
There is the power supply voltage is applied to by ,, TC slave station 15 ₁ charging.
At time T63, since a certain time Tx has elapsed since the power supply voltage was applied to the TC slave station 15 ₁ , the switch SW1 is closed, and as a result, the next section B is also charged, and the sound phase of the TC slave station 15 ₂ is restored. The power supply voltage is applied to. Then, at time T64, the TC slave station 15 ₂ detects the operation of the disconnection detection relay 17 ₂ , and the switch SW2 remains open even after the elapse of a certain time Tx from time T63.

The operation of the circuit breaker 1 for breaking and reclosing the distribution line is performed via the information transmission device 18, and the operation of the disconnection detection relay and the open / closed state of the switch are controlled by the TC slave station devices 15 and T.
It is input to the arithmetic unit 13 via the C master station unit 12. In addition,
The parts other than the distribution system are as shown in Fig. 1,
It is omitted in FIG. The disconnection section determination means 13A determines the disconnection section based on these pieces of information.

A disconnection section determining means 13A will be described with reference to FIGS.
Will be described. In step S71 of the flow chart of FIG. 7, when the reclosing information of the distribution line breaker 1 is obtained from the information transmission device 18, the process proceeds to step S72. In step S72, a certain time is waited to confirm that the distribution line is charged. In step S73, the switches SW1, SW2, SW3, SW4, SW5 and SW connected to the distribution line are connected.
6, open / closed state of TSW7, disconnection detection relay 17 ₁ ......
17 Check the operating status of ₅ .

In step S74, as a result of the above confirmation,
Since the disconnection detection relay 17 has detected the disconnection, it is confirmed whether or not some of the switches are open. In the example of FIG. 5, the switch SW2 is in the released state because the wire breakage occurs at the point A, and the wire breakage detection relay 17 ₂ detects the wire breakage. At this time, the process proceeds to step S75 and the switch SW2
The power source side section, that is, section B is determined to be the disconnection occurrence section. This is [claim 2]. If the disconnection detection relay 17 ₂ does not detect the disconnection in step S73,
By the determination in step S74, the process proceeds to step S76, and it is determined that there is no broken section.

Next, in order to promptly restore the power failure due to the instantaneous ground fault due to the disconnection, the power interchange switch operation procedure creating means 13C has the section C after the switch SW2 which maintains the open state, For the section D, a process of creating a switch operating procedure for accommodating electric power is performed. The power interchange switch operation procedure creating means 13C will be described with reference to the flowchart of FIG.

In step S81, the power failure section, that is, the section to which the power interchange is applied is grasped. In the example of FIG. 5, it is section C and section D. In step S82, the switch SW3 in the detected power failure section and the switch SW2 and TSW6 connected to the adjacent section are searched. Based on the information of the power failure section and the switch obtained in steps S81 and S82, the power interchange calculation for the power failure section is performed in step S83.

In step S84, it is determined whether or not power interchange is possible, and if possible, the process proceeds to step S85 to create a switch operating procedure for power interchange. In the example of FIG. 5, a procedure is created in which electric power is exchanged from the switch SW2 or the interconnection switch TSW6. If it is determined in step S84 that power interchange is impossible, the process proceeds to step S86 and power interchange is disabled.

Next, in order to restore the disconnection state of the distribution line, the disconnection section disconnection switch operating procedure preparing means 13B disconnects the disconnection section. The disconnection section disconnecting switch operating procedure creating means 13B will be described with reference to FIG. First, in step S91, the disconnection section determined by the disconnection section determination means 13A is set, and the process proceeds to step S92. Step S92
Then, the switch group forming the disconnection section is searched. Figure 5
In the example, the switches SW1, SW2 and SW4 are searched. Next, in step S93, the switch on the most power source side is searched from the switch group. In the example of FIG. 5, the switch SW1 is searched. In step S94, the opening procedure of the switch found in step S93 is created.

The switch operation instruction means 13D outputs an operation execution instruction to the TC master station 12 in accordance with the switch operation procedure created by the disconnection section disconnection switch operation procedure creation means 13B. In addition, when a new healthy power failure section occurs due to the execution of this disconnection section disconnection switch operation procedure, the switch for supplying power to the section is again used by using the power interchange switch operation procedure creation means 13C. Create operating procedure and open circuit operation instruction means 13
D outputs the operation execution instruction to the TC master station 12. In the above description, the output of the information transmission device 18 is directly input to the arithmetic device 13, but the arithmetic device 13 is transmitted via the TC master station 12.
It may be input to the disconnection section determination means 13A.

[0030]

As described above, according to the present invention, when an instantaneous ground fault occurs due to a wire break in a distribution system, a quick power transmission operation can be performed first at a place where a power failure occurs, and a wire break section is further provided. Can be separated. For this reason, since the work contents that were conventionally performed by all the mobilization of operators and maintenance personnel can be automated, it is possible to respond quickly and accurately,
It is possible to provide a distribution system operation device that can save labor in operation and maintenance and can significantly reduce accident recovery time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a distribution system operation device according to the present invention.

FIG. 2 is a flowchart showing the function of the TC slave station 15.

FIG. 3 is a time chart showing the relationship between the power supply voltage of the TC slave station 15 and the open / close state of the switch.

FIG. 4 is a time chart showing the relationship between the power supply voltage of the TC slave station 15 and the open / closed states of the disconnection detection relay 17 and the switch.

FIG. 5 is a diagram showing an example of a power distribution system.

FIG. 6 is a time chart showing a relationship between the circuit breaker 1 and the switch.

FIG. 7 is a flowchart showing the function of a disconnection section determination means 13A.

FIG. 8 is a flowchart showing the function of the power interchange switch operating procedure creating means 13C.

FIG. 9 is a flowchart showing the function of a disconnection section disconnection switch operation procedure creating means 13B.

[Explanation of symbols]

 100 Substation Bus 200 Distribution line 1 Distribution line breaker 2 Ground fault detection device 3 Reclosing device 12 TC master station 13 Computing device 13A Disconnection section determination means 13B Disconnection section disconnection switch operation procedure creation means 13C Power interchange switch operation Procedure creation means 13D Switch operation instruction means 15 TC slave station 17 Disconnection detection relay 18 Information transmission device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunori Asahina, 991, Anada Town, Seto City, Aichi Prefecture, Aichi Plant, Toshiba Corporation (72) Inventor, Shiro Okada, 991, Aichi, Seto City, Aichi Prefecture, Aichi Plant

Claims (2)

[Claims] 1. A disconnection state signal of a circuit breaker for a distribution line of a distribution system, an opening / closing state signal of a switch for connecting distribution lines divided into a plurality of sections, and a disconnection state for each section of the distribution line. A remote monitoring control slave station device provided with a disconnection detection relay for detecting, and a load current signal of each distribution line that is preset or a section load current signal captured online using the remote monitoring control master station device, and In a distribution system operation device that operates the distribution system using connection information that indicates how the distribution sections are connected to each other, installs on the distribution line provided that the breaker for the distribution line operates. Using the operation information of the disconnection detection relay of the remote monitoring control slave station device and the open information of the switch concerned,
A disconnection section determination means for determining the section on the power supply side where the remote monitoring control slave station device in which the information is operating at the same time is installed as a disconnection occurrence section, and a disconnection section separation opening / closing for creating an operation procedure for removing the disconnection section A switch operating procedure creating means, a switch operating procedure creating means for creating a switch operating procedure for accommodating electric power from the disconnection section to a sound power failure section on the load side, and a switch operating procedure creating the switch operating procedure for the remote monitoring control parent. A distribution system operation device comprising switch operation instruction means that is executed by using a station device and a remote monitoring control slave station device. 2. After a predetermined time after obtaining the reclosing of the distribution line breaker, it is detected by the operation of the disconnection detection relay whether there is a switch that is open, and when there is a switch that satisfies these conditions, The power distribution system operation device according to claim 1, wherein the power supply side section of the switch is determined as a disconnection section.